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考虑岩体的流变特性,运用弹性--黏弹性对应准则及Laplace数值逆变换对矿柱支撑的采空区顶板岩层变形进行了分析,建立了采空区顶板挠度随时间的变化关系,揭示了采空区顶板位移随时间变化的特性.研究表明,在考虑岩体流变性质的情况下,采空区顶板下沉位移随时间延长而增大,在给定比较长的时间跨度,即使坚硬岩体顶板位移仍会达到相当大的量值,进而引起采空区顶板破断.通过对邢台石膏矿塌陷案例分析,验证了计算方法的可行性.
Considering the rheological characteristics of rock mass, the deformation of top rock strata of the mined-out area supported by pillar with pillars is analyzed by elastic-viscoelastic correspondence criterion and Laplace numerical inverse transform, and the relationship between roof deflection and the deformation of mined-out area is established. The roof displacement of the goaf changes with time.Research shows that under the condition of the rheological properties of the rock mass, the displacement of the roof sinking in the goaf increases with time, and for a given time span, The roof displacement of hard rock mass will still reach a considerable amount, which will cause the roof of the goaf to be broken.Through the case analysis of Xingtai gypsum mine collapse, the feasibility of the calculation method is verified.